Demagnetizer.



Patented May l3, I902.

G. BUETTGER.

DEMAGNETIZER; (Application filed Mar. 24,1902.)

(l0 Model.)

UNITED. STATES:

ATEN QF R GUSTAV BOE'ITGER, OF MILWAUKEE, WISCONSIN.

DEMAGNETIZER.

SPECIFICATION forming part of Letters Patent No. 699,863, dated May 13,1902 Application filed March 24,1902. Serial No. 99,633- (No model.)

To all whmn it may concern.-

Be it known that I, GUSTAV BOETTGER, a citizen of the United States, anda resident of Milwaukee, in the county of Milwaukee and 5 State ofWisconsin, have invented certain new and useful Improvements inDemagnetizers; and I do hereby declare that the following is a full,clear, and exact description thereof.

My invention has for its object to provide simple, economical, andcompact apparatus having utility with an electrical current ofsufficient intensity as means for demagnetizing various devices,especially watches and tools, said invention consisting in what ishereinafter particularly set forth, with reference to the accompanyingdrawings, and subsequently claimed.

Figure 1 represents a plan view of an apparatus in accordance with myinvention electrically connected to conductors of an electricserviceline or a generator of sufficient electric energy; and Fig. 2, apartly-sectional elevation of the apparatus, this view being indicatedby lines 2 2 in the first figure.

Referring by letter to the drawings, A indicates an insulating-base; B,an insulatingslide on the base; 0, a handle in connection with one endof the slide, and D an insulating-block fast on said base and providedwith a guide-groove for said slide, the length of which approximatesthat of the aforesaid base.

Fast on slide B, longitudinally of the same, are combs E F, of conductormaterial, ar-

ranged so that the teeth of one are centralof' the intervals betweenteeth of the other.

Fast on block D and extending through a longitudinal slot of same tohave contact with continuous upper face portions of combs E F arespring-brushes G H, constituting terminals of local-circuit conductorshaving binding-post terminals I J for connection with conductors K L ofan electric-service system or a generator of sufficient electric energy,an incandescent electric lamp M or other resistance being put in thelocal circuit, if neoessary. Other spring-brushes P Q, fast on block D,extend through the slot of same to have contact with the teeth of theopposing combs E F on slide B, and these brushes are electricallyconnected to a hollow-core electromagnet R, mounted on said block. Theslide and combs thereon constitute a polechanger, and in practice thesame is actuated to cause frequent reverses of the direction of currentthat goes through the electromagnet. When the brush P has contact with atooth of comb E and there is contact of brush Q with a tooth of comb F,the current will flow through brush G, comb E, brush P, theelectromagnet, brush Q, comb F, and brush H, but there being contact ofbrush P with a tooth of comb F and brush Q with a tooth of comb E thecurrent flows through brush G, comb E, brush Q, the electromagnet, brushP, comb F, and brush H, the rapidity of the reverses of the direction ofcurrent through said electromagnet being in proportion to the speed ofmovement on the part of the pole-changer, the latter being moved in onedirection only or reciprocated, as may be necessary or desirable.

A magnetized watch, tool, or other device is placed in the hollow coreof the electromagnet, and the local circuit being energized byconnection with an electric-service system or generator the pole-changeris operated to effect its function, there being continued operation ofsaid pole-changer while the device under treatment is exposed in theenergized electromagnet, the result being demagnetization ofsaid device.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A demagnetizer comprising a hollowcore electromagnet, a pair ofconductor-combs mounted on a slide to have the teeth of one in intervalsbetween the teeth of the other, circuit-terminal brushes in contact withcontinuous face portions of the combs, and other brushes arranged inelectric connection with said magnet to have contact with the combteeth.

2. A demagnetizer comprising a hollowcore electromagnet', a pair ofconductor-combs mounted on a slideto have the teeth of one in intervalsbetween the teeth of the other, circuit-terminal brushes in contact withcontinuous face portions of the combs, resistance in circuit with saidbrushes,- and other brushes arranged in electrical connection with saidmagnet to have contact with the comb-teeth.

3. A demagnetizer comprising an insulating-base, an insulating-slide onthe base, a

with said magnet to extend through the block-slot and contact with thecomb-teeth.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in 15 the county of Milwaukee and State of WVisconsin, in thepresence of two Witnesses.

GUSTAV BOETTGER.

Witnesses:

H. G. UNDERWOOJ), N. E. OLIPHANT.

